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Editorial Team
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Asked: 2026-05-28T06:01:42+00:00

I currently have a JVM-based network client that does an HTTP long poll (aka

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I currently have a JVM-based network client that does an HTTP long poll (aka comet) request using the standard java.net.HttpURLConnection. I have timeout set very high for the connection (1 hour). For most users it works fine. But some users do not receive the data sent from the server and eventually time out after 1 hour.

My theory is that a (NAT) router is timing out and discarding their connections because they are idle too long before the server sends any data.

My questions then are:

Can I enable TCP keep-alive for the connections used by java.net.HttpURLConnection? I could not find a way to do this.

Is there a different API (than HttpURLConnection) I should be using instead?

Other solutions?

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1 Answer

  1. Editorial Team

    There does not appear to be a way to turn on TCP keep-alive for HttpURLConnection.

    Apache HttpComponents will be an option when version 4.2 comes out with TCP keep-alive support.

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